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import pygame, sys

screen = pygame.display.set_mode ([1000, 800])
screen.fill ([255, 255, 255])

x = 100


color =((255 , 0 , 0 )) 

startpos = ((200 + x, 100 + x )) 

endpos = ((200 , 125))

pygame.draw.line(screen, color, startpos, endpos, 1) 
pygame.display.flip() 


while True: 
     for event in pygame.event.get(): 
        if event.type == pygame.QUIT: 
          sys.exit()
        elif event.type == pygame.KEYDOWN: 
           if event.key == pygame.K_a:
                x = x + 100
        elif event.type == pygame.KEYUP:
            if event.key == pygame.K_a:
                x = x + 100